<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <img src="" alt="">
    <button>带年纪</button>
</body>
</html>
<script>
    const img = document.querySelector("img");
    const btn = document.querySelector("button");

    
    btn.addEventListener("click",()=>{
        const xhr = new XMLHttpRequest();
        xhr.open('get',"https://dog.ceo/api/breeds/image/random",true);
        xhr.send();
        xhr.onload =function(){
            const res = JSON.parse(xhr.response)
            console.log(res.message);
            img.src = res.message
        }
    })
    
</script>